#region Apache License
//
// Licensed to the Apache Software Foundation (ASF) under one or more 
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership. 
// The ASF licenses this file to you under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with 
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion

using System;
using System.IO;

namespace log4net.Util.PatternStringConverters
{
    /// <summary>
    /// Write the current process ID to the output
    /// </summary>
    /// <remarks>
    /// <para>
    /// Write the current process ID to the output writer
    /// </para>
    /// </remarks>
    /// <author>Nicko Cadell</author>
    internal sealed class ProcessIdPatternConverter : PatternConverter
    {
        /// <summary>
        /// Write the current process ID to the output
        /// </summary>
        /// <param name="writer">the writer to write to</param>
        /// <param name="state">null, state is not set</param>
        /// <remarks>
        /// <para>
        /// Write the current process ID to the output <paramref name="writer"/>.
        /// </para>
        /// </remarks>
#if NET_4_0
        [System.Security.SecuritySafeCritical]
#endif
        override protected void Convert(TextWriter writer, object state)
        {
#if (NETCF || SSCLI)
			// On compact framework there is no System.Diagnostics.Process class
			writer.Write( SystemInfo.NotAvailableText );
#else
            try
            {
                writer.Write(System.Diagnostics.Process.GetCurrentProcess().Id);
            }
            catch (System.Security.SecurityException)
            {
                // This security exception will occur if the caller does not have 
                // some undefined set of SecurityPermission flags.
                LogLog.Debug(declaringType, "Security exception while trying to get current process id. Error Ignored.");

                writer.Write(SystemInfo.NotAvailableText);
            }
#endif
        }

        #region Private Static Fields

        /// <summary>
        /// The fully qualified type of the ProcessIdPatternConverter class.
        /// </summary>
        /// <remarks>
        /// Used by the internal logger to record the Type of the
        /// log message.
        /// </remarks>
        private readonly static Type declaringType = typeof(ProcessIdPatternConverter);

        #endregion Private Static Fields
    }
}
